Self-development of the treatment performance of multi stage vertical flow constructed wetlands working for two years

Abstract

 Water quality in the multi stage vertical flow constructed wetland treating livestock wastewater was monitored and its treatment performance for two years after start-up was evaluated. Although the performance for the first year was affected by the seasonal variation of water temperature, the treatment capacity during winter season was improved significantly at second year, resulting in robust annual treatment performance of the second year. It suggested that the first year's performance of constructed wetland reflected the adapting process to the regional climate condition and the robust developped performance appeared from second year. Based on the treatment performance obtained for second year, the basic treatment unit for BOD, SS, TKN, T-N and T-P was determined as 26.2g-BOD/m²·d, 21.0g-SS/m²·d, 1.60g-TKN/m²·d, 1.55g-T-N/m²·d and 0.36g-T-P/m²·d, respectively.